A Monroe County man is accused of sexually assaulting a young girl he was entrusted with babysitting between 2008 and 2009 in Bethlehem, according to court records.

Warren R. Klopp Jr., 26, of Saylorsburg, Pa., watched a then 4-year-old girl and sexually assaulted her between Dec. 1, 2008, and July 31, 2009, at a home in the 1100 block of Mechanic Street in Bethlehem, police say. Authorities say Klopp was 22 at the time.

Police learned about the accusations during an interview with the girl and her mother on Oct. 11, court papers say. Klopp was first interviewed Oct. 17, where he denied all the allegations against him, according to court papers.

During an interview at a state police barracks Jan. 7, court papers say Klopp admitted to having sexual contact with the child.

Klopp was arraigned today before District Judge Nancy Matos Gonzalez and charged with two counts of involuntary deviate sexual intercourse with a child, indecent assault of a child less than 13 years old, endangering the welfare of a child and corruption of minors.

Klopp was sent to Northampton County Prison in lieu of $50,000 bail with a 10 percent option. Klopp is not permitted to have contacts with minors should he post bail, court papers say.